A fool in Norway flew his 9m (354") Ventus glider with a 20-25 lb turbine and obtained a level speed of 137-139 km/h (87mph). I call him a fool for attempting a loop the way he did. Just watching the wing and spar flex during normal flying should have told him not to attempt what he did. Dang, it looks cold there, can you imagine the power a DA150 would make he he.
http://www.modellfly.us/hmk/video/videos/ventus.wmv